CNA Training, specifically certified nurseís aide training, prepares those who undergo it to work in a variety of health service venues, either with short-term stay patients or long-term stay residents. These venues can be hospitals, for example, rehab centers, or nursing homes.

In the superstructure of health care it is the doctor who diagnoses and prescribes. Meanwhile, at the next level, it is the nurse working at a long or short-term stay health care facility whose job it is to deliver the treatments and drugs the doctor has prescribed to the resident or patient, as well as document the progress of the patients or residents in his or her care. Those with cna training work under the supervision of a nurse, delivering hands on care. Often, it is the CNAs, acting in their capacity, who serve as an invaluable extra set of eyes and ears for the nurse.

Because they are often the first caregiver the resident or patient calls on, as well as the caregiver who usually spends the most one on one time with the patient or resident, it is often the CNA who first notices important changes in those they care for. These changes in the patient or residentís catalog of symptoms are very important, as they affect both the ongoing care of the resident or patient as well as the documentation the nurse must maintain. Aside from making use of their eyes, their ears, and their training, which alerts them what to look for, CNAs also collect official data using various health care implements. They do this by taking, blood pressures, temperatures and other kinds of measurements, useful for documenting a resident or patientís progress or decline.